Interaction between indoor environment and human exergy load
|Forfattere||Matjaz Prek, Vincenc Butala|
|Institusjon||University of Ljubljana, Ljubljana, Slovenia.|
|Nøkkelord||indoor environment, human physiology, thermal comfort, exergy|
|Redaktør||Vojislav Novakovic, Sten Olaf Hanssen, Hans Martin Mathisen|
AbstraktThe aim of this work was to establish a human – indoor environment interaction based on exergy analysis. Most human thermal models are based on following requirements: the body is in heat balance, and the mean skin temperature and sweat rate influencing this heat balance are within certain limits. These processes are described by applying the first law of thermodynamics and thermal comfort is related to the thermal load. Applying the second law principle to the human body, exergy is destroyed (or entropy produced) as a consequence of heat and mass transfer or conversion. These processes are dependent on the human thermoregulatory system and on the state of the environment. For the determination of heat and mass flows, a relatively simple and well-known two-node model was employed, dependent on environmental and physiological conditions. This model was expanded by applying the 2nd law of thermodynamics in order to calculate the exergy destruction. The extended analysis clearly shows the impact of specific environmental parameters on exergy destruction.
This approach enables the definition of a combination of indoor parameters that ensures minimal human exergy destruction with regard to physiological parameters. We verified of this approach by comparing the standard PMV value and the corresponding exergy destruction. The results also promise the possibility of linking human thermal comfort with human exergy load.
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